Wedge Lock Quick Change System

Interchangeable holders allow contractors to switch from standard milling drum to fine or micro milling drum simply by changing holders.

Tapered wedge locking system and precision machined

parts insure uniform gauge length throughout the entire length of drum (unlike morse taper quick change sytems).

Interchangeable holders allow contractors to vary bit

count to achieve smaller or larger gradation. Has two to three times more space between the wraps

compared to all other fine and micro mill drums, in-creasing production by providing extra room for materi-al flow.

Base blocks are designed to last the life of the machine

making it the most durable quick change system on the market.

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Standard ⅝” (15mm) Triple Wrap Drum

-Speed is a much larger factor on surface texture. -Pattern is uneven and choppy at common operating speeds.

Keystone’s 2R2 Wrap Drum

-Pattern is uniform at different cutting speeds. -Bit consumption decreases with repeating bit design. -Material sizing is smaller.

Wrap Design Technology to Minimize Forward Cutting Speeds Effect

WRAP DESIGN AND MICRO MILLING

⅝” standard triple wrap drum at 60’/min shows surface strikes at ⅝”, 1 ¼” and 1 ⅞” (15mm, 30mm 45mm)

.31” (8mm) Triple Wrap Fine Mill Drum (300 bits) vs. 2R2 Standard Drum (200 bits)

-More bits do not guarantee a smoother surface.

.47” (12mm) 2R2 Fine Mill Drum vs. 5.31” (8mm) Triple Wrap Drum at same cutting speed

-Tighter drum spacing does not guarantee smoother surface patterns.

The Effect of Forward Cutting Speed on Surface Pattern